Date: Fri, 11 Feb 2011 10:50:11 GMT From: Robert Schulze <rs@bytecamp.net> To: freebsd-fs@FreeBSD.org Subject: Re: kern/136944: [ffs] [lor] bufwait/snaplk (fsync) Message-ID: <201102111050.p1BAoBSu093495@freefall.freebsd.org>
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The following reply was made to PR kern/136944; it has been noted by GNATS. From: Robert Schulze <rs@bytecamp.net> To: rene@freebsd.org Cc: bug-followup@freebsd.org Subject: Re: kern/136944: [ffs] [lor] bufwait/snaplk (fsync) Date: Fri, 11 Feb 2011 11:18:46 +0100 Hi, I can confirm that, too: lock order reversal: 1st 0xffffff0019291cc8 ufs (ufs) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:423 2nd 0xffffff81ef169978 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2636 3rd 0xffffff00074647e8 ufs (ufs) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:544 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x49 witness_checkorder() at witness_checkorder+0x7d3 __lockmgr_args() at __lockmgr_args+0xd0b ffs_lock() at ffs_lock+0xac VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b _vn_lock() at _vn_lock+0x5d ffs_snapshot() at ffs_snapshot+0x1b79 ffs_mount() at ffs_mount+0x5c5 vfs_donmount() at vfs_donmount+0xcd4 nmount() at nmount+0x74 syscallenter() at syscallenter+0xe5 syscall() at syscall+0x55 Xfast_syscall() at Xfast_syscall+0xe2 --- syscall (378, FreeBSD ELF64, nmount), rip = 0x8007acfdc, rsp = 0x7fffffffe9a8, rbp = 0x800a04530 --- lock order reversal: 1st 0xffffff81ef06e6f8 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:2636 2nd 0xffffff0015bcc630 snaplk (snaplk) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:2223 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x49 witness_checkorder() at witness_checkorder+0x7d3 __lockmgr_args() at __lockmgr_args+0xd0b ffs_copyonwrite() at ffs_copyonwrite+0x161 ffs_geom_strategy() at ffs_geom_strategy+0x159 bufwrite() at bufwrite+0xff ffs_sbupdate() at ffs_sbupdate+0x94 ffs_sync() at ffs_sync+0x489 sync_fsync() at sync_fsync+0x136 VOP_FSYNC_APV() at VOP_FSYNC_APV+0xb5 sync_vnode() at sync_vnode+0x143 sched_sync() at sched_sync+0x1c6 fork_exit() at fork_exit+0x12a fork_trampoline() at fork_trampoline+0xe --- trap 0, rip = 0, rsp = 0xffffff8245289cf0, rbp = 0 --- lock order reversal: 1st 0xffffff0015bcc630 snaplk (snaplk) @ /usr/src/sys/kern/vfs_vnops.c:296 2nd 0xffffff0019291cc8 ufs (ufs) @ /usr/src/sys/ufs/ffs/ffs_snapshot.c:1587 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a kdb_backtrace() at kdb_backtrace+0x37 _witness_debugger() at _witness_debugger+0x49 witness_checkorder() at witness_checkorder+0x7d3 __lockmgr_args() at __lockmgr_args+0xd0b ffs_snapremove() at ffs_snapremove+0xe2 softdep_releasefile() at softdep_releasefile+0x133 ufs_inactive() at ufs_inactive+0x153 VOP_INACTIVE_APV() at VOP_INACTIVE_APV+0xb9 vinactive() at vinactive+0x89 vputx() at vputx+0x3c6 vn_close() at vn_close+0x10b vn_closefile() at vn_closefile+0x51 _fdrop() at _fdrop+0x20 closef() at closef+0x58 kern_close() at kern_close+0xff syscallenter() at syscallenter+0xe5 syscall() at syscall+0x55 Xfast_syscall() at Xfast_syscall+0xe2 --- syscall (6, FreeBSD ELF64, close), rip = 0x800844b1c, rsp = 0x7fffffffe9a8, rbp = 0 --- this was after hot-resetting, maybe due to a background fsck. with kind regards, Robert Schulze
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